If you have already placed a registration form on your site through an app, you can disable the registration section of your login page by going into the 'Settings' portion of the Yovigo backend.
On that page select the 'Advanced' tab at the top. Within the 'Advanced' page you will see a table listed with a 'Registration Form' line.
To the right of that line select 'Manage'. This will take you to a page with a toggle selection and a WYSIWYG Content Editor. This allows you to place any content to the left of the login section on the login page. Make sure to toggle the dropdown to 'Disable' for this feature to work.